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The surprise set went down after Madonna's Minnesota show last night
The record is the musician's 35th studio record
Singer had recently claimed it's a 'bad time for music'
The recording dates back to August 1983
‘There's not a lot of pop music in the mainstream that makes you feel scared,’ says singer
3rdEye Girl and Prince release 'The Hit & Run Album' in September
Lack of control over music's use is chief gripe
Prolific songwriter's latest scheduled for September 7